公开(公告)号：US20240328998A1

公开(公告)日：2024-10-03

申请号：US18580750

申请日：2022-07-19

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Hoon SOHN ,  Hyung Jin LIM ,  Jongsu LEE

IPC: G01N27/72 ,  G01B11/14 ,  G01N33/204

CPC classification number: G01N27/72 ,  G01N33/204 ,  G01B11/14

Abstract: For non-destructively measuring the yield strength of a metallic member using magnetic incremental permeability, a quasi-static excitation magnetic field is applied to two points of the metallic member, while a small alternating magnetic field generated by a transmitting coil is applied to the metal member. Intensity of the quasi-static excitation magnetic field applied to the metallic member is measured using a Hall sensor. The magnetic field induced by the magnetized metallic member is detected using a sensing coil. Using signals from the Hall sensor and the sensing coil, a reversible permeability (MIP) of the metallic member is obtained. A grain size of the metallic member is obtained from the relationship between the reversible permeability and the grain size of the metallic member, and the yield strength of the metallic member is calculated using the grain size. The grain size and yield strength of the metallic member can be measured non-destructively.